Azo dyestuffs containing a 1-lower alkyl-6-hydroxypyrid-2-one coupling component

ABSTRACT

Water-insoluble monoazo dyestuffs of the formula:   WHEREIN A is an optionally substituted aryl radical, n is 0 or 1, Z is an optionally substituted alkyl or aryl radical, one of X1 and X2 is hydrogen, optionally substituted alkyl or aryl or CN, -COR, -COOR or -CONR1R2 and the other is -CN, -COOR -COR or CONR1R2, R being optionally substituted alkyl or aryl and R1 and R2 being independently hydrogen or optionally substituted alkyl or aryl. The use of the said dyestuffs for colouring synthetic textile materials.

United States Patent [191 Berrie et al.

[451 Sept. 16, 1975 AZO DYESTUFFS CONTAINING A l-LOWER ALKYL-6-HYDROXYPYRID-2-ONE COUPLING COMPONENT Inventors: Alistair Howard Berrie; Nigel Hughes, both of Manchester, England Assignee: Imperial Chemical Industries Limited, London, England Filed: June 23, 1969 Appl. No.: 835,751

Foreign Application Priority Data June 27, 1968 United Kingdom 30763/68 U.S. Cl 260/156; 260/294.9; 260/295 R;

260/295 AM Int. C11 C09B 29/36; DO6P 3/52 Field of Search...' 260/156, 146 R References Cited UNITED STATES PATENTS 2,431,190 11/1947 Morgan 260/156 X 3,487,066 12/1969 Rittcr et al 260/156 Primary Examiner-Floyd D. Higel Attorney, Agent, or Firm-Cuslhman, Darby &

- Cushman 57 ABSTRACT Water-insoluble monoazo dyestuffs of the formula:

1 (CH X A N X2 N H I 0 Z wherein A is an optionally substituted aryl radical, n is O or 1, Z is an optionally substituted alkyl or aryl radical, one of X and X is hydrogen, optionally substituted alkyl or aryl or CN, COR, COOR or CONRR and the other is CN, COOR COR or CONRR R'being optionally substituted alkyl or aryl and R and R being independently hydrogen or optionally substituted alkyl or aryl.

The use of the said dyestuffs For colouring synthetic textile materials.

7 Claims, No Drawings AZO DYESTUFFS CONTAINING A l-LOWER ALKYL-6HYDROXYPYRID-Z-ONE COUPLING COMPONENT This invention relates to water-insoluble monoazo dyestuffs which are valuable for colouring synthetic textile materials in particular aromatic polyester textile materials. I

According to the invention there are provided the water-insoluble monoazo dyestuffs free from sulphonic acid and carboxylic acid groups which, in one of the possible tautomeric forms, are represented by the formula:

1 (ca x A-NQN wherein A is an optionally substituted aryl radical, n is 0 or 1, Z is an optionally substituted alkyl or aryl radical, one of X and X is a hydrogen atom or an optionally substituted alkyl or aryl radical or a CN, COOR, COR or CONRR radical, and the other of X and X is a -CN, COOR, COR or CONRR radical, R is an optionally substituted alkyl or aryl radical, and R and R each independently represent a hydrogen atom or an optionally substituted alkyl or aryl radical or R and R together form with the nitrogen atom N a 5- or 6-membered nitrogencontaining heterocyclic ring.

The monoazo dyestuffs of the invention can exist in a number of tautomeric forms. For convenience the dyestuffs have only been formulated in one of these forms, but it is to be understood that the specification includes within its scope the dyestuffs in any of the possible tautomeric forms.

As examples of the optionally substituted aryl radicals represented by A there may be mentioned optionally substituted naphthyl radicals, and preferably optionally substituted phenyl radicals, in particular phenyl radicals containing one or more substituents such as chlorine, bromine, cyano, trifluoromethyl, nitro, lower alkyl such as methyl, lower alkoxy such as methoxy, lower alkyl sulphonyl such as methylsulphonyl, lower alkyl carbonyl such as acetyl, acylamino such as acetylamino, di (lower alkyl) amino such as diethylamino, phthalyl (so as to form an anthraquinonc nucleus), carbo lower alkoxy such as carbomcthoxy and carboethoxy and hydroxy and lower alkoxy substituted derivatives thereof such as carbo-,8- methoxyethoxy, carbo-B-hydroxyethoxy and carbo-B- (B'-ethoxyethoxy ethoxy, sulphonamido and N lower alkyl, N:N-di (lower alkyl) and N-phenyl derivatives thereof such as sulphonN-methylamido, sulphon NzN di (ethyl) amido. sulphonanilide and sulphon-N- ethylanilide, carbonamido andN- lower alkyl and NzN di (lower alkyl) derivatives thereof such as carbon-N? methylamido and carbon-N:N di (ethyl) amido, and sulphamato (OSO NH and N- lower alkyl and N:N di (lower alkyl) derivatives thereof.

Throughout this specification the terms lower alkyl and lower alkoxy" are used to denote alkyl and alkoxy radicals respectively containing from 1 to 4 carbon atoms.

The optionally substituted alkyl radicals represented by Z, X, X R, R and R are preferably optionally substituted lower alkyl radicals; and as examples of such radicals there may be mentioned lower alkyl such as methyl, ethyl, n-propyl and n-butyl, hydroxy lower alkyl radicals such as ,B-hydroxyethyl and B- or 'y-hydroxypropyl, phenyl lower alkyl radicals such as benzyl and ,B-phenylethyl, and lower alkoxy lower alkyl radicals such as B-(methoxy or ethoxy)ethyl and 'y-methoxypropyl. The optionally substituted aryl radicals represented by Z X, X R, R and R are preferably optionally substituted phenyl radicals; and as examples of such radicals there may be mentioned phenyl itself and tolyl, chlorophenyl, anisyl, bromophenyl and dimethylphenyl.

As examples of the 5- and 6-membered nitrogencontaining heterocyclic rings formed from R, R and the nitrogen atom there may be mentioned morpholino, piperidino and pyrrolidino.

According to a further feature of the invention there is provided a process for the manufacture of the waterinsoluble monoazo dyestuffs of the invention which comprises coupling a diazo compound of an amine of the formula A--NH with a coupling component of the formula: I

Formula 1 ll Z wherein A, X, X Z and n have the meanings stated, and the amine and coupling component are free from sulphonic acid and carboxylic acid groups.

The process of the invention can be conveniently carried out by adding the diazo compound, which can, for example, be in the form of a solution or suspension in an aqueous acidic medium, to a solution or suspension of the coupling component in water and/or a watersolubilising liquidoptionally containing an inorganic acid or an alkali metal-hydroxide or carbonate, if necessary adjusting the pH of the mixture to effect coupling, and thereafter isolating the resulting dyestuff by conventional methods.

As examples of'the amines of the formula A-NH there may be mentioned l-naphlthylamine or 2-chlorol naphthylamine, but more especially amines of the benzene series such as aniline, o-, mor p-toluidine, 0-, mor panisilidine, o-, mor p-chloroaniline, 0-, mor p-bromoaniline, o-, mor p-nitroaniline, 2:5- dichloroaniline, 2:4-dinitroaniline, 2:4-dinitro-6- (chloro or bromo)aniline, 4-methanesulphonylaniline, 4-aminobenzotrifluoride, 4- or 5-nitro-2-toluidine. 4- or 5-nitro-2-anisidine, 4- or 5-chloro-2-anisidine, 4- or 5-chlorr'i-2-toluidine, 4- or 5-bromo-2-anisidine, 2:6- di(chloroor bromo-)-4-'nitroaniline, 2:4:6- trinitroanilinc, 2:4-dinitro--carbomethoxyaniline, 2- amino-S-nitrobenzotrifluoride, 2:4-bis(methanesulphonyl)aniline, 2(chloroor bromo-)-4-nitroaniline, methylanthranilate, 4- or 5nitromethylanthranilate, 4-aminobenzamide, 2:6-di(chloroor bromo-)-aniline- 4-sulphonamide, 2:6-di( chloroor bromo- )4- methylsulphonylaniline, 2:5-di(chloroor bromo-)- 2-amino-3:S-dinitrobenzotrifluoride, 3-amino-2-(chloroor bromo-)-4:6-dinitro- (toluene or anisole), 3-amino-4-(chloroor bromo-)-2:6-dinitro-(toluene or anisole), 2- or 4- 4:6-di-nitroaniline,

cyanoaniline, 4-nitro-2-cyanoaniline 2:4-dinitro-6- cyanoaniline, 2-nitro-4-cyanoaniline, 2-chloro-4- cyanoaniline, 4-aminodiphenyl, lor 2 aminoanthraquinone, 3-amino-2:4: 6-trinitrotoluene,

2-phenylsulphamyl-4-nitroaniline, methyl 2-amino-3- (chloroor bromo-)-5-nitrobenzoate, dimethyl 2' aminoterephthalate, dimethyl 2-amino-5- nitroterephthalate, Bmethoxyethyl 4-aminobenzoate, B-hydroxyethyl 4-aminobenzoate, aniline 2-, 3- or 4- sulphamate, 2-amino-4-chlorophenyl sulphamate and aniline 2-, 3- or 4-NzN-dimethylsulphamate.

A preferred class of coupling components for use in the process of the invention comprises the componds of the formula:

wherein Z is an optionally substituted lower alkyl or phenyl radical and'X is a lower alkyl radical. Preferably X is the methyl radical and Z an optionally substituted lower alkyl radical in particular the ethyl or 'y-methoxypropyl radical.

The coupling components of Formula I can themselves be obtained by a number of methods, such as are described, for example, in Heterocyclic Compounds Pyridine and its derivatives Part 3 which was edited by Klingsberg and published by lnterscience Publishersin 1962. Typical methods include, for example, (1) condensing together compounds ofthe formulae: X(CH ),,COCH COOalkyl and X CH COOalkyl in the presence of an excess of an amine of the formula Z-NH (2) cyclisation of an azB-disubstituted glutaconamide of the formula:

alkyl OOCCH C C CONHZ,

which is itself obtained by condensing together in the presence of a basic catalyst compounds of the formula by cyclisation of an azB-disubstituted glutaconamide of the formula:

which is itself obtained by condensing together in the presence of a basic catalyst compounds of the formula X(CH ),,CO.CH CONZ and X CH .COOalkyl.

As specific examples of the said coupling components there may be mentioned l-(methyl or ethyl)-3 cyano-4-methyl-6-hydroxypyrid-2-one, l-( B- hydroxyethyl or 'y-methoxypropyl)-3-cyano-4-methyl- 6-hydroxypyrid-2-one, l-(pnenyl, p-tolyl or p-anisyl)-3-cyano-4-(methyl or phenyl)-6- hydroxypyrid-Z-one and l-phenyl-3-(carbonamidoor carboethoxy)-4-(methyl or phenyl)-6-hydroxypyrid- 2-one.

One preferred class of the monoazo dyestuffs of the invention comprises the dyestuffs wherein A represents an optionally substituted phenyl radical.

A second preferred class of the monoazo dyestuffs of the invention comprises the dyestuffs of the formula:

A ium CN wherein A is an optionally substituted aryl radical and preferably an optionally substituted phenyl radical, Z is an optionally substituted lower alkyl or phenyl radical and X is a lower alkyl radical.

Preferably X is the methyl radical. It is further preferred that Z is an optionally substituted lower alkyl radical in particular an ethyl or y-methoxypropyl radical.

The water-insoluble monoazo dyestuffs of the invention are valuable for colouring synthetic textile materials, in particular cellulose acetate and cellulose triacetate textile materials, polyamide textile materials such as polyhexamethyleneadipamide textile materials, and preferably aromatic polyester textile materials such as polyethylene terephthalate textile materials. Such textile materials can be in the form of thread, yarn, or woven or knitted fabric.

Such textile materials can conveniently be coloured with the monoazo dyestuffs, as hereinbefore defined, by immersing the textile material in a dyebath comprising an aqueous dispersion of one or more of the said dyestuffs, which dyebath preferably contains a nonionic, cationic and/or anionic surface-active agent, and thereafter heating the dyebath for a period at a suitable temperature. In the case of secondary cellulose acetate textile materials it is preferred to carry out the dyeing process at a temperature between 60 and C.; in the case of cellulose triacetate or polyamide textile material it is preferred to carry out the dyeing process at to C; in the case of aromatic polyester textile materials the dyeing process can either be carried out at a temperature between 90 and 100C., preferably in the presence of a carrier such as diphenyl or 0- hydroxydiphenyl, or at a temperature above 100C,

preferably at a temperature between 120 and 130C., under superatmospheric pressure.

Alternatively the aqueous dispersion of the said monoazo dyestuff can be applied to the textile material by a padding or printing process,- followed by heating or steaming of the textile material. In such processes it is preferred to incorporate a thickening agent, such as gum tragacanth, gum arabic, or sodium alginate, into the aqueous dispersion of the said monoazo dyestuff.

At the conclusion of the colouring process it is preferred to give the coloured textile material a rinse in water or a brief soaping treatment before finally drying the coloured textile material. In the case of aromatic polyester textile materials it is also preferred to subject the coloured textile material to a treatment in an alkaline aqueous solution of sodium hydrosulphite before the soaping treatment in order to remove loosely attached dyestuff from the surface of the textile material.

The monoazo dyestuffs have excellent affinity and building up properties on synthetic textile materials, and in particular on aromatic polyester textile materials, so enabling heavy depths of shade to be obtained. The resulting colorations which range in shade from yellow to violet, have excellent fastness to light, to wet treatments, and, in particular, to dry heat treatments such as those carried out at high temperatures during pleating operations.

If desired the dyestuffs of the invention can be applied to synthetic textile materials in conjunction with other disperse dyes, such as are described in, for example, British Pat. Nos. 806271, 835819, 840903, 847175, 852396, 852493, 859899, 865328, 872204, 894012, 908656, 909843, 910306, 913856, 919424, 944513, 944722, 953887, 959816, 960235, and 961412.

The invention is illustrated but not limited by the following Examples in which the parts are percentages are by weight.

EXAMPLE 1 Ten parts of a 14 percent aqueous solution of sodium nitrite are added to a solution of 1.9parts of aniline in a mixture of 100 parts of water and 25 parts of a 7.1 percent aqueous solution of hydrochloricacid, the temperature being maintained between and C. by external cooling. The resulting solution of the diazo compound is then gradually added to a solution of 4.5 parts of l-phenyl-3cyano-4-methyl-6-hydroxypyrid-2'one and 5 parts of sodium acetate in 100 parts of a l percent solution of sodium hydroxide at a temperature between 0 and 5C., and the mixture is stirred for 15 minutes at the same temperature. The mixture is then acidified with acetic acid, and the precipitated dyestuff is filtered off, washed with water and dried.

When dispersed in aqueous medium the so-obtained dyestuff dyes aromatic polyester textile materials in greenish-yellow shades of excellent fastness to light, to washing and to dry heat treatments. The dyestuff also has excellent build-up properties on polyester textile materials so enabling heavy depths of shade to be readily obtained. 9 5

The l-phenyl-3-cyano-4-methyl-o-hydroxypyrid- 2-one used in the above'Example was itself obtained by condensing acetoacetanilide with ethyl cyanoacetate in the presence of sodium ethoxide.

0 The following Table gives further Examples of the monoazo dyestuffs of the invention which are obtained by diazotising the amines listed in the second column of the Table, and coupling the resulting diazo compounds with the coupling components listed in the third column of theTable by methods similar to that described in Example 1. The fourth column of the Table gives the shades obtained when the Dyestuffs are applied to aromatic polyester textile materials.

Examples Amine Coupling Components Shade 2 o-nitroaniline 1-phenyl3-cyano-4-methyl-G-hydroxypyrid-2-o-ne Greenish-yellow 3 o-chloroaniline do. do. 4 p-chloroaniline do. do. 5 ethyl p-aminobenzoate do. do. 6 3-aminophenyl-N:Nahmethyl-sulphomate do. do. 7 B-ethoxyethyl-paminobenzoatc do. do. 8 [3-hydroxyethyl-p-arninobenzoate do. do. 9 p-toluidine do. Reddish-yellow 10 p-anisidine do. do. 1 l aniline 1-ethyl-3-cyano-4-methyl-6-hydroxypyrid-2-one Greenish-yellow l2 ethyl p aminobenzoate do. d0. 13 B-ethoxyethyl-p-aminobenzoate do. do. 14 B-hydroxyethyl-paminobenzoate do. do. 15 o-nitroaniline do. do. 16 m-nitroaniline do. do. 17 p-nitroaniline do. do. 18 p-aminobenzenesulphonamide do. do. 19 p-uminobcnzenc sulphon-N-ethyl-amide do. do. 20 2:4-dichloroaniline do. do. 21 2:4:5 trichloroanilinc do. do. 22 ptoluidine do. Reddish-yellow 23 p-anisidinc do. do. 24 p-aminoacetanilinde do. do. 25 Ndp-uminophcnyl)phthalimide do. Orange 26 aniline l-(y-methoxypropyl )-3-cyuno-4-methyl-6 Greenish-yellow hydroxypyrid2one 27 p-chlorounilinc do. do. 28 cthyl-p-uminobenzoate do. do. 29 3-aminophenyl-NzN-dimethyl-sulphamatc do. do. 30 aniline l-(B-hydroxycthyl )-3-cyano-4-mcthyl do.

6-hydroxy-pyrid-2-one 31 p-chloroanilinc do. do. 32 pnitroanilinc do. do. 33 ethyl p-aminobcnzoutc do. do. 34 p-aminobenzcnesulphonamide do. do.

-Cntinued zamples Amine Coupling Components Sh d 2:4-dichloroaniline l-phenyl-3-cyano-4-methyl-6-hydroxypyriddo.

2-one 36 l3-methoxyethyl 4-amino-benzoate do. do. 37 4-aminobenzenc sulphon-N-ethylamide do. do. 38 aniline l-( p-methoxyphenyl )-3'cyuno-4-methyl-6- hydroxypyrid-Z-one 39 4-chloroaniline do. do. 40 do. l-( p-N-ethylsulphamoylphenyl )3'cyz1no-4- do.

methyl-6-hydroxypyrid-2-one 41 aniline do. do. 42 Z-uminno-p-xylene l-ethyl-3-cyano-4-methyl-6- Reddish-yellow hydroxypyrid-2-one 43 4-chloroaniline do. Greenish-yellow 44 2:5-dichloroaniline do. do. 45 2:4:6-trichlornaniline do. do. 46 2-chloro-4-nitroaniline do. do. 47 2-methoxy-4-nitroaniline do. Reddish-yellow 48 2-methoxy-5-nitroaniline do. do. 49 4-methoxy-2-nitroaniline do. Orange 50 B-methoxyethyl 4-aminobenzoate do. Greenish-yellow 5l dimethyl aminoterephthalate do. do. 52 3-aminophenyl-N:N-dimethyl do. do.

sulphamate 53 4-aminobenzenesulphon-N-ndo. d

propylamide 54 4-aminobenzenesulphon-NzN- do. d

dimcthylamide 55 4-aminobenzenesulphon-N:N-di do. d

(n-propyl )umide 56 4-aminobenzenesulphon-N- do. do.

phcnyl-Nethylamide 57 3-aminobenzenesulphon-N:N- do. do.

dimethylamide 58 4-aminobenzamide do. do. 59 4-aminobenz-N-ethylumide do. do. 60 4 aminobenz-N:N-dicthylumide do. 1 61 5-chloro 2-methyluniline do. do 62 5-chloro-2-melhoxyunilinc do. Rcddish-yellow 63 4-melhyl-2'nitroaniline do. 1 64 2-methyl-4-nitroaniline do. d 65 4-chloro-2-nitroaniline do. do. 66 Z-methyl-S-nitrouniline d0. Grcenish-ycllow 67 B-mcthoxyelhyl 3-aminobenzoute do. d 68 3-uminobenzenc sulphon-N-ethylumide do. d 69 3-aminohcnzenesulphon-NzN-diethylamide do. d 70 4-chlom'2methylaniline do. do. 7| 4-chloro-2-methoxyuniline do. Reddishycllow 72 B-methhoxyethyl Z-aminobenzoate do. Grcenish-yellow 73 B-('B'-methoxyethoxy )ethyl do. do.

4-uminobcnzoate 74 B-(B-ethoxyethoxy)ethyl do. do.

4-aminobenzoale 75 a:B-bis(methoxy)isopropyl 4-umino do. d

benzoutc 76 4-aminobenzenesulphon-N-ethylumide l ('yn1cthoxypropyl)-3-cyuno-4- d mothyl--hydroxypyrid-Z-onc 77 2:4-dichloroaniline do. 78 2:4:6-trichloroaniline do. d 79 S-chloro-Z-methylanilinc do. do. 80 5-chloro-2-methoxyanilino do. Reddish-ycllow 8l 2-nitroaniline do. Greenish-yellow 82 3-nitroaniline do do. 83 4nilrouniline do. do. 84 4-methyl-2-nitroanilinc do. Reddish-yellow 85 2-methyl-5-nitrouniline do. do. 86 2-methyl-4-nilrouniline do. do. 87 4-chloro-2-nitroaniline do. Yellow 88 2chloro-4-nitroaniline do. do. 89 fi-methoxyethyl 4-aminobenzoate do. Grecnish-ycllow 90 4-aminobenzenesulphon-N:N-dicthylumidc do. do. 91 3-aminobenzenesulphon-N:Ndie1hylzlmidc do. do. 92 3-aminobenzenesulphon-N-ethylumidc do. do. 93 4-chloro-2-methylzmilinc do. Yellow 94 4-chloro-2-methoxyaniline do. Reddish-yellow 95 4 methoxy-2-nitrouniline do Orange 96 2methoxy 5-nitrouniline do. Yellow 97 2-mcthoxy-4-nitrounilinc do. Orange 98 2:4:5-trichloroanilinc l-( fihydroxycthyl )-3-cyano-4-mcthyl-6- Grcenish-yellow hydroxypyrid-Z-one 99 Z-nitrounilinc do. do. I00 3-nitroaniline do. do. lOl fi-mcthoxycthyl 4aminoben7.oz\tc do. do. I02 B-hydroxycthyl 4-aminohenzoale do. do. l 03 4-aminoacctanilidc do. Orange I04 4-uminohenzcncsulphon do. Greenish-yellow N-cthylumidc 4-aminobcnzumidc do. do. 106 4-aminobcnz-N-clhylamidc do. do. l07 4-dielhyluminouniline l-elhyl-3-cyuno-4-mclhyl-6-hydroxypyrid-Z-onc Violet I08 l-naphlhyluminc do. Rcddish-yellow I09 Z-chlorol -nuphlhylaminc do. do. l l() do. do.

l-uminoanlhruquinone Continued Examples 'Amim: Coupling Components Shade 1 l l Z-aminbanthraquinone do. do. l 12 4-aminodi'pl1eny'l do. Greenish-yellow l 13 4-chloroaniline l-benzyl-3cyano-4-methyl-6-hydroxypyrid-Z-one do. I l4 2nitrouniline do. do. 1 [5 do. l-(o-tolyl)-3-cyano-4'methyl--hydroxypyriddo.

2-one l 16 4-chloroaniline I do. do. 1 17 do. l-(o-methoxyphenyl)-3-cyano-4-methyl-6- do.

hydroxypyrid-2one 1 l8 Z-nitroaniline do. do. 1 l9 2-nitroaniline l-( 2:4-dimethylphenyl)-3-cyano-4-methyl do.

-6hydr0Xypyrid-2-o'ne 120 4-chloroaniline do. do. 12] 4-methoxy-2-nitroaniline do. do. 122 2nitroaniline l-( p-chlorophenyl )-3-cyano-4-methyl-6- do.

hydroxypyrid-2-one I23 2-chloroaniline l-(naphthl '-yl )-3-cyano-4-methyl-6- do.

hydroxypyrid-2-one 124 4-chloroaniline do. I 25 3-nitroaniline l-ethyl-3-carboethoxy-4methyl-G-hydroxy pyrid-Z-one 126 do. 1-ethyl-3-carbobcnzyloxy-4-methyl-6- l27 4methoxy-22nitroaniline do. 128 2:4-dichloroaniline l-ethyl-3-carbumoyl-4-methyl-6-hydroxypyrid- Z-one I29 do. l-ethyl-3-N:N-diethylcarbumoyl-4-methyl 6- hydroxypyrid-Z-one I30 2-chloroaniline l-ethyl-3-N-phenylcarbamoyl-4-methyl-6- do.

' hydroxypyrid-Z-one I 3 l ethyL4-uminobenzoatc do. do. 132. Z-nitroaniline do. do.

133 4-methoxy-2-nitrouniline do. Orange 134 2-methoxy-4-nitrouniline do. do,

l 3-nitrouniline do. Greenish-yellow l 36 4-chlorouniline lethyl-3-( piperidin-l -ylcarbonyl-4- do.

methyl-6-hydroxypyrid-2one l3 7 Z-nilrozmilinc do. do. 138 4-chlorounilinc l-ethyl3-acetyl-4-rnethyl-6-hydroxypyriddo.

2-one 139 4-diethylaminoaniline do. Violet 140 4-diethylumino-Z-mcthylaniline do. Bluish-violet I41 4-chlomanilinc l-ethyl-3-cyuno-4-ethoxycz1rbonylmethyl-6- Greenish-yellow hydroxypyrid2-one 142 do. l'ethyl-3-cyano-4carboethoXy 6-hydr0xypyrid-2-one do. 143 2-nitrouniline do. do. I44 ethyl-4-uminobenzoate do. do. I45 4-methoxy-2-nitroaniline 1-ethyl-3-cyano-4-carbamoyl-6-hydroxypyrid Orange 2-one 14 g inili l-ethyl-3-cyuno-4-Nethylcarbamoyl=6- Greenish-yellow hydroxypyrid-Z-one l47 3-nitrounilinc do. do. 148 4-chloroaniline do. d [49 Z-methoxyaniline do. Reddish-yellow I50 2-methoxy-4-nitrouniline do. Orange I51 4methoxy-2-nitroaniline do. do. 152 do. 1-ethyl-3-cyano-4-phenyl-6-hydroxypyriddo.

2-one l5 3 do. l-ethyl-3-cyano 4-( p-methoxyphenyl )-6- do.

hydropypyrid-Z-one 154 do. lethyl-3-cyano4-( p-chlorophenyl )-6 do.

hydroxypyrid-Z-one 155 do. l-cthyl-3-cyano-4-( N-ethylcarbamoylme'thyl )-6 do.

' hydroxypyrid-Z-onc I56 4-c hloroaniline l-cthyl-4N-ethylcarbamoyI-6-hydrdxypyrid- Grecnish-yellow 2-one 157 do. l-ethyl-4-carboethoxy-6-hydroxypyriddo.

2-one I58 2:4-dinitro-o-hromounilinc l-ethyl-3-cyano 4-methyl-6- Yellow hydroxypyrid-Z-one I59 2-eyano-4-nitrouniline do. do. I60 4-methylsulphonylanilinc do. do. l 6 l 2-trifluoromethyluniline do. do. 162 4acetylaniline do. do. 1 63 2-nitroaniline l-ethyl-3-cyano4-cyan0methyl-6- do.

hydroxypyrid-Z-one I64 4-chloroanilinc do. do. l 65 do. l-ethyl 3-cyano-4-acetylmethyI-6- do.

hydroxypyrid-Z-one l 66 2 nitroaniline do. do.

The l-ethyl-3-cyan0-4-rnethyl-6 hydroxypyrid-2-one used in the above Examples wasobtained by cohdensing together ethyl acetoacetate, ethyl eyanoacetz ite 21nd 65 The ethylamine.

The

l-( 'ymcthoxyordoyl )-.3-.eyano.-.4.-n1e thyl-6- hydroxypyrid-Z-one used in: the above exam les was obtained by condensing together ethyl acetoacetate, ethyl cyanoacetate and 'y-methoxypropylamine.

l-( ,B-hydroxyethyl )-3-cyano-4-methyl-6- hydroxypyrid-Z-one used in the: above Examples was obtained by condensing together ethyl acetoacetate, ethyl cyanoac-etate and B-hydroxyethylamine.

The l-( o-methoxyphenyl )-3-cyano4-methyl-6- hydroxypyrid-Z-one, l-(p-methoxyphenyl)-3-cyano-4- methyl-6-hydroxypyrid-2-one, 1-(o-tolyl)-3-cyano-4- methyl-6-hydroXypyrid-Z-one, l-( p-N- ethylsulphamoylphenyl)-3-cyano-4-methyl-6- hydroXypyrid-Z-one', 'l-(2:4-dimethylphenyl)-3- cyano-4 methyl-6-hydroxypyrid-2-one, and l-(pchloroph enyl)-3-cyano-4-methyl--hydroxypyrid- 2-one, used in the above Examples were obtained bycondensing the appropriately substituted acetoacetanilide with ethyl cyanoacetate in the presence of sodium ethoxide.

l-Bcnzyl-3-cyano-4-methyl-6-hydroxypyrid-2-one was obtained by condensing together ethyl acetoacetate, ethyl cyanoacetate and benzylamine.

l-( Napht'h-l '-yl )-3-cyano-4-methyl-6-hydroxypyrid- 2-one was obtained by condensing acetoacet-lnaphthylamide with ethylcyanoacetate in the presence of sodium ethoxide.

- l Ethyl-3-carboethoxy-4-methyl-o-hydroxypyrid- 2-one'jwas obtained by condensing acetoacetethylamidewithdiethylmalonate in the presence of sodium ethoxide'This product on transesterification with benzyl alcohol gave l-ethyl-3-carbobenzyloxy-4-methyl-6- hydroxypyrid-Z-one.

1-Ethyl-3-(carbamoyl, NzN-diethylcarbamoy'l, N- phenylcarbamoyl or piperidin-l-ylcarbamoyl)-4- methyl-o-hydroxypyrid-2-one were obtained by treat ing l-ethyl-3-carboethoxy-4-methyl-6-hydr0xypyrid- 2-one with, ammonia, diethylamine, aniline and piperidine respectively,

l-Ethyl-3-acetyl-4-methyl-6-hydroxypyrid-Z-one was obtained by reacting l-ethyl-4-methyl-6-hydroxypyrid- 2-one with acetyl chloride in the presence of aluminum chloride.

l-Ethyl-3-cyano-4-ethoxycarbonylmethyl-6- hydroxypyrid-Z-one was obtained by condensing ethylacetone dicarboxylate with cyanoacetethylamide in the presence of sodium ethoitide.

l-Ethyl-3-cyano-4-carboethoxy-o-hydroxypyrid- Z-one was obtained by condensing the diethyl ester of nxaloacetic acid with cyanoacetethylamide in the presince of sodium ethoxide. This product on treatment with ammonia, ethylamine or aniline gave the corre- ;ponding 4-carbamoyl derivatives.

l-Ethyl-3-cyano-4-(phenyl, p-methoxyphenyl and v-chlorophenyl)-6-hydroxypyrid-2-one were obtained 3y condensing together ethyl benzoylacetate or the pnethoxy or p-chloro derivatives thereof, ethyl cyanoacetate and ethylamine.

l-Ethyl-3-cyano-4-( N-ethylcarbamoylmethyl )-6- iydroxypyrid-2-one was obtained by reacting l-ethyl- 3-cyano-4-ethoxycarbonylmethyl-6-hydroxypyrid- Z-one with ethylamine.

l-ethyl-4-N-ethylcarbamoyl-6-hydroxypyrid-2-one was obtained by heating a mixture of citric acid and :thylamine under pressure. This compound on hydroly- ;is and subsequent esterification gave 1-ethyl-4- :arboethoxy--hydroxypyrid-2-one.

l-ethyl-3-cyano-4-cyanomethyl-6-hydroxypyrid- Z-one was obtained by condensing together ethyl :yanoacetoacetate, ethyl cyanoacetate and ethylamine.

1-ethyl-3-cyano-4-acetylmethyl--hydroxypyrid- Z-one was obtained by condensing together ethyl 3:5- lioxohexanoate, ethyl cyanoacetate and ethylamine.

We claim:

1. Water-insoluble monoazo dyestuff free from sulphonic acid and carboxylic acid groups having the general formula, I i

20 alkoxy, lower alkylsulphonyl, lower alkyl carbonyl,

acetylamino, di(lower alkyl) amino, phthalyl, carbo lower alkoxy, carbo lower alkoxy lower alkoxy, carbo hydroxy lower alkoxy, sulphonamido, N-lower alkyl sulphonamido, N:N-di(lower alkyl) sulphonamido, N phenyl sulphonamido, carbonamido, N-lower alkyl carbonamido, N:N-di(lower alkyl) carbonamido, sulphomato, N-lower alkyl sulphamato and N:Ndi(lower alkyl) sulphamato; n is an integer of 0-1; Z is selected from the group consisting of lower alkyl, hydroxy lower alkyl, lower alkoxy lower alkyl, benzyl, naphthyl, phenyl and phenyl substituted by a substituent selected from the group consisting of lower alkyl, chlorine, lower alkoxy and sulphonamido;

X is selected from thegroup consisting of cyano,

carbo lower alkoxy, lower alkyl carbonyl and CONRR and X is selected from the group consisting of hydrogen and lower alkyl, wherein R and R each independently are selected from the group consisting of hydrogen, lower alkyl and phenyl and R and R together with the nitrogen atom to which they are attached, form the ring selected from the group consisting of morpholino, piperidino and pyrrolidino rings.

2. Water-insoluble monoazo dyestuff free from sulphonic acid and carboxylic acid groups having the gen eral formula 1 (CH X A-N=N I X2 HO 0 T 2 wherein A is selected from the group consisting of phenyl, naphthyl and phenyl substituted with a member selected from the group consisting of chlorine, bromine, cyano, trifluoromethyl, nitro, lower alkyl, lower alkoxy, lower alkylsulphonyl, lower alkyl carbonyl, acetylamino, di(lower alkyl) amino, phthalyl, carbo lower alkoxy, carbo lower alkoxy lower alkoxy, carbo hydroxy lower alkoxy, sulphonamido, N-lower alkyl sulphonamido, NzN-difloweralkyl) sulphonamido, N-

phenyl sulphonamido, carbonamido, N-lower alkyl carbonamido, NzN-di (lower alkyl) carbonamido, sulphamato, N-lower alkyl sulphamato and N:N-di(lower alkyl) sulphamato; Z is selected from the group consisting of lower alkyl, hydroxy lower alkyl, lower alkoxy lower alkyl, benzyl, naphthyl, phenyl and phenyl substituted by a substituent selected from the group consisting of lower alkyl, chlorine, lower alkoxy and sulphonamido;

n 1; one of X and X is selected from the group consisting of cyano, carbo lower alkoxy, lower alkylcarbonyl and CONRR and the other of X and X is selected from the group consisting of hydrogen, lower alkyl, phenyl, phenyl substituted by a substituent selected from the group consisting of lower alkyl, lower alkoxy, chlorine, cyano, carbo lower alkoxy, lower alkyl carbonyl and -CONRR", wherein R and R each independently are selected from the group consisting of hydrogen, lower alkyl and phenyl and R and R together with the nitrogen atom to which they are attached. form the ring selected from the group consisting of morpholino, piperidino and pyrrolidino rings. 3. A virtually water-insoluble azo compound free from sulfonic acid groups and having the formula R CN OH m

A-N=N CN wherein A has the meaning given in claim 1; X is lower alkyl; and Z is selected from the group consisting of lower alkyl, hydroxy lower alkyl, lower alkoxy lower alkyl and phenyl.

6. The water-insoluble monoazo dyestuff of claim 1 having the formula A-N=N CN HOl o N ltH cH cH ocH wherein A has the meaning given in claim 1.

7. The water-insoluble monoazo dyestuff of claim 1 having the formula AN=N I CN H0 I o wherein A has the meaning given in claim 1. 

1. WATER-INSOULABLE MONOAZO DYESTUFF FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS HAVING THE GENERAL FORMULA,
 2. Water-insoluble monoazo dyestuff free from sulphonic acid and carboxylic acid groups having the general formula
 3. A virtually water-insoluble azo compound free from sulfonic acid groups and having the formula
 4. A compound of the formula
 5. The water-insoluble monoazo dyestuff of claim 1 having the formula
 6. The water-insoluble monoazo dyestuff of claim 1 having the formula
 7. The water-insoluble monoazo dyestuff of claim 1 having the formula 